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- Rare Plant Club,
- Rare Plants Nursery.
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- Rasmussen's Fruit Farm and Nurseries.
- Rasmussen's Fruit Farm.
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- Rasoamanana, Nicole
- Rasoazanany, Malalatiana
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- Raspische Buchhandlung (Neurenberg)
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- Ratekin Seed House.
- Ratekin's Seed House.
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- Rathbun, R
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- Rathbun, Richard, 1852-1918
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- Rathbun's Nursery.
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- Rationalist Press Association.
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- Ratliff, Raymond D
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- Ratnasingham, Sujeevan
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